The Architecture of Human Language
What did this language decide, and who decided differently?
66 sections, no frequency marks
The books are not competing accounts of the same material. One states the theory; the other two cut the same language along different axes, so a phenomenon shows up once per series with a different question asked of it.
The shelf volume numbers repeat across series by design
What did this language decide, and who decided differently?
66 sections, no frequency marks
What kind of thing is this, and what else is like it?
117 sections, 48 frequency-rated
How does this language express what I am trying to say?
310 sections, 205 frequency-rated
A concordance pass counted the links that already exist between the books. They run one way. El Árbol points at The Reference thirty-three times; The Reference points back zero times, and the one volume that maps the two books against each other omits the framework series entirely despite ten inbound links to it.
Those missing reverse edges are the reason this is an app rather than a folder. Because the three run in parallel rather than in sequence, a volume is named by its series and its number together: three different volumes are each numbered 01, and they have nothing to do with one another.